Vacuum Pumping, Refrigerant Adding - Gree GMV-Y120WL/A-T Owner's Manual

4) Joints of indoor and outdoor unit should be wrapped with insulating material and
leave no gap between pipe and wall..
5) Thermal insulating material of branches should be the same as that of the pipeline.
The attached foam of branches cannot be taken as insulating material.
6) When wrapping the tape, the later circle should cover half of the former one. Don't
wrap the rape too tight, otherwise the insulation effect will be weakened.
7) After wrapping the pipe, apply sealing material to completely seal the hole on the
wall.
4.3.8 Support and Protection of Pipeline
(1) Support should be made for hanging connection pipe. Distance between each support
cannot be over 1m.
(2) Protection against accidental damage should be made for outdoor pipeline. When
pipeline exceeds 1m, a pinch board should be added for protection.

4.4 Vacuum Pumping, Refrigerant Adding

4.4.1 Vacuum Pumping
(1) Outdoor unit has been charged with refrigerant before delivery. Field-installed
connection pipe needs to be charged with additional refrigerant.
(2) Confirm whether outdoor liquid and gas valves are closed.
(3) Use vacuum pump to withdraw the air inside indoor unit and connection pipe from the
outdoor valve, as shown below.
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